Phase Regulation and Defect Passivation Enabled by Phosphoryl Chloride Molecules for Efficient Quasi-2D Perovskite Light-Emitting Diodes.

Abstract in brief

• The study demonstrates that phosphoryl chloride molecules, particularly bis2oxo3oxazolidinyl phosphinic chloride (BOPCl), can improve quasi2D perovskite LED performance by controlling crystal growth and passivating defects, leading to highly efficient and reproducible devices with an EQE up to 20.82%.
• BOPCl works by slowing down the crystallization process to promote better phase distribution and remaining at grain boundaries to reduce defect density, which enhances light emission efficiency in perovskite LEDs.
• This research introduces a new approach for optimizing perovskite films using specific molecular modifications, addressing issues like phase heterogeneity and defect density, thus advancing the development of more efficient quasi2D perovskite light-emitting devices.]